Table of Contents
What is CometD Java Server?
CometD ships a JavaScript client library, a Java client library and a Java server library. This allows you to write applications in the browser with fine-grained logic and control on the server.
What is CometD protocol?
CometD is a scalable HTTP-based event routing bus that uses an AJAX push technology pattern known as Comet. It implements the Bayeux protocol. Long polling, also called Comet programming, allows emulation of an information push from a server to a client.
What is EMP connector Salesforce?
EMP Connector is a free, open-source, community-supported tool. Salesforce provides this tool as an example of how to subscribe to events using CometD. To contribute to the EMP Connector project with your own enhancements, submit pull requests to the repository at https://github.com/forcedotcom/EMP-Connector.
What is streaming API in Salesforce?
Streaming API is your radar. It lets you define events and push notifications to your client app when the events occur. You don’t have to keep an active lookout for data changes or custom notifications—you don’t have to constantly poll Salesforce and make unnecessary API requests.
What are streaming APIs?
Streaming APIs are used to read data in real-time from the web for consumers for precise, up-to-date results. For example, they are typically used by social media platforms to deliver media content such as audio and data. Typically Social Networks tend to use WebSocket, which is a subset of Streaming APIS.
Does Salesforce support WebSockets?
Salesforce servers do not support WebSockets.
How is Kafka different from REST API?
Kafka – Data is stored in topic. Seek back & forth (offsets) whenever you want till the topic is retained. REST – Once the response is over, it is over.
Is stream API free?
These are the best streaming APIs that you can integrate into your application to enable streaming of data directly from your application. Most of them are free to use, select the best API based on your application.
What is the difference between a rest and streaming API?
The difference between REST APIs and streaming APIs is: Streaming APIs updates are sent to the consumer when an event happens. REST APIs operate in a client-server architecture.
What is Salesforce streaming API?
What is the cometd Java implementation?
The CometD Java implementation is based on the popular Jetty Http Server and Servlet Container, for both the client and the server, version 9 or greater. CometD Java Libraries and Servlet 3.0
How do I set up a cometd server?
Advanced Configuration for the Java Server The simplest way to setup a CometD server is to deploy your CometD application under context path /, and the CometD Servlet mapped to e.g. /cometd/*. In this way resources such as HTML, CSS and — more importantly — JavaScript files (in particular cometd.js) will belong to the same domain.
Does cometd enforce a strict order on server-to-client message delivery?
By default, CometD does not enforce a strict order on server-to-client message delivery, nor it provides the guarantee that messages sent by the server are received by the clients. The message acknowledgmentextension provides message ordering and message reliability to the Bayeux protocol for messages sent from server to client.
How do I authenticate my application using cometd?
The recommended way to perform authentication in CometD is to pass the authentication credentials in the initial handshake message. Both the JavaScript handshake APIand the Java Client handshake APIallow an application to pass an additional object that will be merged into the handshake message and sent to the server: